Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 597fe9c84782ff56341fec404a1780cd0b2aac72f8e8a9ea978c0e3cbccfe8bd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16